Traders see near-even odds among 21–23°C for São Paulo’s July 8 maximum because short-range ensemble forecasts from regional models show only modest spread around the seasonal norm of roughly 21°C. A lingering subtropical ridge is expected to limit strong cold-air advection from the south while allowing modest daytime heating under partly cloudy skies; however, slight differences in the timing and strength of a weak frontal boundary or increased low-level moisture could trim or add 1–2°C. Official INMET guidance and global model runs remain tightly clustered, with resolution hinging on the exact afternoon peak recorded at the primary urban station. No major synoptic shift is anticipated before the 24-hour window closes.